The Saiyans were extra-terrestrial lifeforms that were from the planet Vegeta. They were advanced, technology wise, so they assimilated the culture and technology of other races (energy detector). They also have no knowledge or talent for agriculture. They did not need agriculture because they would just take whatever they wanted from their enemies. Their technology now, is more advanced than Earth's but they did not develop it. They are very strong combattants. They have black hair, black eyes, yellow skin and they are born with a tail. The whole Saiyan race was exterminated by Freeza.

-Oosaru (giant monkey transformation)-

This is the Saiyans special technique. When the Saiyans look at the full moon, they transform into giant monkeys. There battle power is ten times greater. The only requirement for this transformation is that the Saiyan must have a tail. This level is achieved by: Goku, Gohan and Vegeta.

-Super Saiyan-

There is a thousand year old Saiyan legend that talks about a "Super Saiyan". This level can be achieved when a Saiyan's power exceeds it's normal limits. The calmness within allied with an intense anger is what makes it possible to acceed to the Super Saiyan level. The Super Saiyan has blond hair that stand up on his head, green eyes and a glowing aura around his body. This level is achieved by: Goku, Gohan, Goten, Vegeta, Trunks, Gotenks, Vegeto and Broly.

-Super Saiyan Level 2-

This level is achieved when a neural surcharge sends energy to the body which makes the muscles bigger. The Super Saiyan level 2 has greater speed and strength than the normal Super Saiyan level. The Super Saiyan level 2 looks pretty much the same as the Super Saiyan but with more muscles. This level is achieved by: Goku, Trunks and Vegeta.

-Super Saiyan Level 3-

The muscular development of the Super Saiyan level 3 reaches its culminating point which gives the combattant phenomenal strength. However, his speed greatly drops and this transformation consumes too much energy which makes it almost useless. The Super Saiyan level 3 has more muscles than the Super Saiyan level 2 and his eyes are completly white. This level is achieved by: Goku and Trunks.

-Super Saiyan 2-

A Super Saiyan that has become two times stronger. Gohan achieves this level naturally when his anger explodes due to Cell's cruelty towards Gohan's friends. For Goku and Vegeta to attain this level, it takes them extreme training. The SS2 looks like the SS but its hair sticks up more and there are little lightning bolts that surround him. This level is achieved by: Gohan, Goku and Vegeta.

-Super Saiyan 3-

By freeing his power to make his limits explode, the Super Saiyan reaches the ultimate phase: SS3. This transformation consumes a lot of energy but is the strongest transformation a Saiyan can achieve. In the next dimension, this transformation has a time limit. The SS3 has long blond hair that goes down his back, green eyes, no eyebrows and like the SS2, lightning that surrounds him. This level is achieved by: Goku and Gotenks.

-Super Saiyan 4-

This level is only seen in DragonBall GT and I don't know much about it. Vegeta reaches this level thanks to the Brute War machine Bulma created. The SS4 has long black hair, baggy eyes and is half monkey half human. This level is achieved by: Goku and Vegeta.

-Gold Oosaru-

This level is also in the DragonBall GT series and cannot be found in the manga. When a Saiyan turns into a Gold Oosaru, his power becomes one hundred times greater. This level is achieved by: Goku and Vegeta.